中文摘要：

熔融法制备布洛芬脂质微丸具有一定的掩味效果。本文通过壳聚糖作为阳离子、明胶为阴离子的离子交互作用,进行层层自组装（layer-by-layer self-assembly,LBL）包衣,以强化矫味效果。以释放特征表征包衣后脂质微丸的矫味效果,证明层层自组装包衣显著抑制了模型药物布洛芬在1 min内的释放速度;用同步辐射红外（synchrotron radiation-based Fourier-transform infrared spectromicroscopy,SR-FTIR）显微成像技术,对包衣后微丸横切面及包衣膜的组成物质分布进行研究。SR-FTIR单谱扫描获取各组分的特征吸收峰,显示脂质微丸表面存在膜组成物质的吸收峰;SR-FTIR的图谱绘制（SR-FTIR mapping）得到微丸横切面的积分分布图和比值谱图,显示药物及膜组成物质的吸收分布,证实在微丸表面包裹有壳聚糖和明胶,并形成了膜结构;另外,单独多次包裹明胶、壳聚糖的微丸表面的比值谱图中均未出现明胶、壳聚糖的特征吸收,进一步证实阴阳离子的静电吸附作用对于包衣膜的形成具有重要作用。本研究建立了包衣膜内物质存在与分布的SR-FTIR成像技术和方法,为药物输送系统中膜的研究提供一个新的有效工具。

英文摘要：

Ibuprofen lipid pellets prepared by melting method could mask the bitter taste of the drug to some extent. The pellets were further coated with chitosan（cationic） and gelatin（anionic） by ionic interaction layer- by-layer self-assembly（LBL） coating to improve masking effects. In this paper, the release percentage of drugs in short time（1 min） was utilized as an indicator for the taste-masking, and it had confirmed the LBL coating inhibited the release of model drug of ibuprofen. Synchrotron radiation-based Fourier-transform infrared spectromicroscopy（SR-FTIR） has been applied to investigate the material distributions on the cross section of pellets and film. Characteristic absorptions of the compositions were obtained by SR-FTIR single spectrum scanning. The distributions of the drug and materials in coated films were determined by SR-FTIR mapping. The FTIR absorptions of chitosan and gelatin on the surface of lipid pellets was examined to verify the existence of chitosan and gelatin on the surface and a film formed using SR-FTIR ratio analysis. Whilst pellets coated only by chitosan or gelatin did not show the typical absorption of chitosan or gelatin, which confirmed the effects of ionic interaction on the film forming process. In conclusion, the method of SR-FTIR established for the study of the existence and distribution of materials in coated film offers a new choice for researches on membranes/films in drug delivery systems and pharmaceutical preparations.